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Estuary with tidal intrusion

Hi, I'm trying to simulate an estuary (the mouth of a river in the sea) but I can't find any information about the steps to follow to model the river that flows into the sea. I have already simulated the tidal hydrodynamic model in the estuary domain using MOHID Water. Then you should do a hydrodynamic model for the whole (tide + river discharge). Is there a guide with steps to follow for this type of simulations? Where can I find it? The explanations I have found are applied to MOHID Land, land drainage, urban flooding.
Thank you.

  • Hello Gabriel,

    Are you simulating a coastal scenario? You can look at setting up such a simulation here: Input wave parameters in a coastal simulation. Have you setup this simulation already?

    Do you want to model flooding due to tidal intrusion front?

    Can you please elaborate a bit more on what you want to simulate?


    Regards,

    Yashodhan Joshi

  • Hello Yashodhan,

    Hello. Thanks for your reply. I am trying to simulate the hydrodynamic model at the mouth of a river. This is about a river that flows into the sea and I need to calculate how the river currents interact with the variation in sea level.
    To accomplish this, I ran a 2D model of the ocean side to get the tide in the river mouth domain. I understood that now I should nest the river simulation, correct? At the moment I don't need to calculate waves.

  • Hi Gabriel,

    Depending on the objectives of the simulation and if you know what the river flow is, you can do this type of simulation using the coastal model/engine (MOHID Water) in OpenFlows FLOOD. In this case, you solve the region of fresh water influence in 3D computing the river mixing with coastal waters. 

    Also depending on the size of river and area of interest you can potentially do everything using only one computational grid. In that case, you need to also add the river bathymetry to the grid and: 

    1) you have to expand your computational grid inland to accomodate the estuarine area of the river (you should simulate the river upstream to where the tide has influence)

    2) increase the grid resolution so that the river is well represented. If this results in a grid too big you may want to refine it using a submodel. If that is the case, I can provide some additional information, please let me know. 

    3) Add the river flow as a Discharge. Add the discharge module into your simulation and specify the location and flow options. 

    Is the focus the coastal/riverine mixing area? Is this only the river? Are you looking to compute river conveyance dependency on the sea level boundary condition? There are many possibiities, so depending on the speficic details I may be able to provide more suggestions. 

    Kind regards,
    Luis

  • Hello Luis, thank you for your answer, it has been very useful. My idea is to simulate an estuary where the mixing zone can be distinguished, the extent of the saline plume in the river generated by the variation in sea level. Based on the options you described to me above, I would think it would be a good idea not to use a nested simulation. I think it is better to extend the grid inland (that is, in the river region) and then add the river with the discharge module. Once we obtain the hydrodynamics of the river, we will be able to run the sediment and heavy metal transport models.
    Again thank you very much and I keep in touch with you.

  • Hello Luis,

    I have modeled the estuary using a higher resolution grid and I used the river as a discharge, but the execution time is too long. I would like to try refining the grid using a submodel. Could you give me information to do this?
    The objective is to calculate the coastal/river mixing area and then use the hydrodynamic model to calculate the sediment transport in the river: this should be useful to find out if the sediments accumulate outside the mouth of the river, or if the tide introduces sediments.
    Thank you very much for your help.